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<head>
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  <title>Document</title>
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<body>
  <script>

    // 目标：了解对象属性名称  --  动态定义 - 插值表达式

    const username = 'user'
    const obj = {
      [username]: 'zs'
    }

    console.log(obj);



  </script>
</body>

</html>